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#1
05-16-2004, 06:42 PM
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W126 cruise module toast.
Hello Everyone
Looking for good used W126 cruise module. Here is a picture of my toasted board.
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ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/ 
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#2
05-16-2004, 06:43 PM
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W126 cruise module toast 2
W126 cruise module toast 2.
Last edited by whunter; 03-09-2011 at 02:21 AM.
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#3
05-16-2004, 06:50 PM
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I need Cruise Control Amplifier
Cruise Control Amplifier $474.09
Part number P5002-70319 Fits 1981 - 1985 Mercedes Benz 300SD Last edited by whunter; 03-09-2011 at 02:21 AM.
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#4
05-16-2004, 07:48 PM
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Check your servo, the increased amp draw probibly ate the transistors that look to be toasted. This is a common thing.
Buy a good soldering iron and fix it, the parts are dirt cheap and it's a single layer PCB.
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One more Radar Lover gone... 1982 VW Caddy diesel 406K 1.9L AAZ 1994 E320 195K
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#5
05-16-2004, 07:50 PM
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Whunter, I think the best bet is to retrofit an aftermarket CC. Wolf-walker has a good thread about doing it. Mine is toast as well and I don't feel like spending a lot of money on another amp that will end up like my old one.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 
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#6
05-16-2004, 07:53 PM
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Quote:
I'll have him using the OEM control stalk before long as well. 
__________________
One more Radar Lover gone... 1982 VW Caddy diesel 406K 1.9L AAZ 1994 E320 195K
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#7
05-16-2004, 08:06 PM
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Wolf, I'm still interested in going the aftermarket route. I have a feeling my servo is bad as well. Do you know what brand the pricier unit was? I'd like to keep the original stalk even though it doesn't really look like it belongs there either. I'd like to get it fixed so I can take it on a long trip this summer.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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#8
05-16-2004, 08:24 PM
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There are really only two parts that go bad with the original system, the amp and the servo. To replace both is not too costly. I replaced the amp in 1995 ($150) and the servo in 1999 ($200). They both still work just fine many years later. Well worth it in my opinion.
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Jovan '84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine) '89 Porsche 911 Turbo Coupe; Black/Black; 53kmi '05 BMW 530i 6-Speed; 302kmi '19 Range Rover; 30kmi
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#9
05-16-2004, 08:25 PM
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Cruise control fix
I've owned my 1983 240D since new. The cruise control thru the years has slowly gone down hill. Tried all the usual fixes/ tests. Probably needed a new amp. Instead I purchased online a Rostra Electronic unit for about $100. The unit installs on the left inner fender with drilling one hole. Connects to the installed cruise control linkage. Fed the wires thru the gromet behind the master brake cylinder. Unplugged the old amp. and plugged the new computer/actuator in that plug. I'm using all the orginal power, vss, and controls. All the cockpit controls work as they should. This system is terrific. Very smooth and reliable. Much better than the orginal system ever was.
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#10
05-16-2004, 08:37 PM
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Larry, what do you mean by,"I'm using all the orginal power, vss, and controls." Does it mean that I have to use my original servo. I think its bad on mine.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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#11
05-16-2004, 09:35 PM
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Quote:
I saw recently(and thiefed the amp of course) an aftermarket VDO cruise on an old 116 car. Had a red plastic amp, our usual servo, but mounted in an odd place and with a long cable connecting it to the throttle lincage. Was very interisting. Amp was dead, naturaly.  As I've said before, the OEM stuff works wonderfully when in tip top shape, and is not ungodly pricy, just fairly so for the little piece of mind you get as to it's life expectancy. For a weekend car or resto job, sure, OEM all the way. But when your like me and may well put 50-80K miles a year on a car, much of that highway with the cruise on, it just does not financialy add up unless you have money to toss around. Anyway, there are other options..
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One more Radar Lover gone... 1982 VW Caddy diesel 406K 1.9L AAZ 1994 E320 195K
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#12
05-16-2004, 10:57 PM
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Quote:
My amp's in the last stages of its death throes, although I think my servo's actually good (I plan to take it apart and clean/lube it at some point)...I was supposed to send my amp to Wolf to play with a while back; hopefully I'll have time to after school lets out... I will admit, though, that I've also heard that the stock CC system has a lifespan of about 50,000 miles of actual use...doesn't sound like a lot to me
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#13
05-17-2004, 12:38 AM
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Rostra cruise
I like the electric Rostra idea so I did a little googleing. Here's a spot to check http://www.rostra.com/cruise-control.htm
After chasing a "find dealer" menu a nearby Pep Boys carries it. I'm checking it out this week. Thanks for the tip Larry!
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Rick Avid Benz watcher Previously owned 126's: 2 1981 300SD's, 1987 300SDL, 1991 350SDL, Previously owned 123's: 1978 300D, 1983 240D, 1985 300D Previously owned 124: 1994 320TE Currently: 2004 Toyota Sequoia SR5 206k 2010 Ford Edge 122k Always looking for the next MB diesel!
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#14
05-17-2004, 12:40 AM
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I hope this is who you where refering to.
Quote:
http://www.rostra.com/ http://www.rostra.com/cruise-control.htm North America: Mike Brock, Vice President Automotive Accessories Group (910) 291-2563 Ed McElligott, III, Regional Fleet Sales Manager (Northeast) (203) 439-0196 Sibyl Ringsdorf, Accessories Account Manager (910) 291-2529 Yates Clifton, Technical Service Manager (910) 291-2253 They have a distributor near me that I will check with.
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#15
05-17-2004, 12:45 AM
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cruise in MI
Here's a link to a distributor that could be near you
1-800-343-1382 M & R ELECTRONICS 5665 STATE ST. SAGINAW, MI. 48603 http://www.mnrelectronics.com/roscruiscon.html Hope you can find the unit you need.
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Rick Avid Benz watcher Previously owned 126's: 2 1981 300SD's, 1987 300SDL, 1991 350SDL, Previously owned 123's: 1978 300D, 1983 240D, 1985 300D Previously owned 124: 1994 320TE Currently: 2004 Toyota Sequoia SR5 206k 2010 Ford Edge 122k Always looking for the next MB diesel!
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